Screen box



Aug. 159 1924 J; A. WHITE SCREEN BOX Filed Sbt. 26

' the screen box, as shown in Fig. 2.

Patented Aug. 19, 1924.

UNITED STATES PATENT OFFICE.

JOSEPH A. WHITE, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE MOORE & WHITE COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF SCREEN BOX.

' Application filed September 26, 1922. Serial No. 590,685.

To all whom it may concern Be it known that I, JOSEPH A. VVHlTE, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Screen Boxes, of which the following is a specification.

My invention relates to certain improvements in screen boxes for screening paper stock.

the object of the invention is to provide a screen box which can be used in connection with a rotary screen for screening material that collects in the vat of the rotary screen.

Another object of the invention is to design the scraper, which is located within the screen box, so that it will keep the surface clear to allow fine stock to pass through the screen.

These objects I attain in the following manner, reference being had to the accompanying drawings, in which:

Fig. 1 is a plan view of my improved screen box for screening paper stock; and

Fig. 2 is an enlarged sectional view on the line 22, Fig. 1, showing a portion of the rotating screen in dotted lines.

Referring to the drawings, 1 is the body of the screen box having two longitudinal side members 2 shaped in cross section as shown in Fig. 2, and having curved portions 3 to which is secured a curved screen 4. The perforations in the screen are suitably spaced and can be of any diameter desired.

5 is a diaphragm secured to the bottom of The diaphragm is clamped between two strips 7 Secured to the lower strip is a wooden beam 7 8 are angular shoes of metal secured to the beams. 9 is a longitudinal shaft on which are mounted two eccentrics 10 having straps 11 of the ordinary type. Attached to the straps by one set of bolts 13 are plates 12.

As the shaft is rotated, the eccentrics cause the plates to come in contact with the shoes 8, which vibrates the diaphragm and causes a suction in the portion 1 1 of the screen box, drawing the paper stock through the perforations in the curved plate. The sides of the box are extended, as shown at 15. Mounted above the curved screen is a shaft 16 having a series of arms 17 secured thereto and set in advance of each other. Attached to these arms is a spiral blade 18 forming a scraper, which travels in close proximity to the curved screen 4 and clears the perforations in the plate of coarse material, allowing fine material to pass through the screen. The arms, in the present instance, are made in two parts clamped to the shaft and to the blade, as shown clearly in Fig. 2.

The shaft 16 is mounted in bearings 19 at each end of the screen box. On the shaft is a sprocket wheel 20 through which the shaft is driven by any suitable power driven shaft. In the present instance, the screen box is illustrated in connection with a rotary screen a, shown by dotted lines in Fig. 2. The screen may be agitated by the eccentric 10 through the rod 21 connected to the eccentric strap 11.

22 is a pipe, which discharges into the screen box and extends to the under portion of the bottom of the vat of the rotary screen a and is provided with a valve 33. It may be coupled to one or more rotating screens, as the screen box can be of such a size as to receive the pulp from a number of rotating screens.

34 is a regulating box located at one side of the screen box and connected to it by a pipe 35. In the box 34 is a short partition 36 to regulate the height of the stock in the screen box. 37 is an outlet pipe communicating with the regulating box, as shown. At the discharge end of the upper section of the screen box is a screw conveyer 38 forming a continuation of the blade 18. 39 are outlet openings for the discharge of coarse I stock.

The operation is as follows: The stock that is too coarse to pass the meshes of the rotary screen is conveyed through the pipe 22 and is discharged into'the upper section of the screen box 2. The spiral blade, which is mounted on the shaft 16, agitates the material and tends to drive the small particles through the screen, preventing waste at the end of the box from which the liquid is discharged. The screened material passes into the space under the curved screen and is carried by a pipe to a regulating box, which determines the height of the stock in the screen box. The diaphragm 5 is acted upon by the eccentrics 10, which agitate the liquid and create suction, drawing the material through the perforations in the screen.

I claim:

1. The combination in a. screen box, of a. casing; a curved screen separating the easing into upper and-lower compartments; a a diaphragm closing-the bottom of the flower compartment; means for impartingmove... ment .to the diaphragm; a shaft; and a rotary .scrapen' ion the shaft, having a blade arra-nged'in close proximity to the curved surface of the screen. I t

2. The combination in a screen box, of a casing having tWo side walls; a curved screen extending from one side Wall to the other'and dividing the screen box intoacompartments; a diaphragm closing the :bottom. of the -lower compartments; means for impartingmovementto the diaphragm; ash-aft extending longitudinally through the upper compartment; and a spiral blade secured to the shaft and located in close proximity to the screen'so that, as'the shaft is rotated it Will :clear the screen, allowing the small particles of material topass through the screen.

8. The=combination in a screenpbox, of a casing; a curved screen mounted in :the easing and dividing the box into upper and lower compartments; a diaphragm forming the bottom of the lower compartment; :21.

beam secured to the ,diaphragm;- a shaft; eccentrics-on the-shaft haying platesllooated so as to vcome in contact with the beam and impart movement to the diaphragm; longitudinally arranged shaft: in the ipper part of the box; arms on Saitlfshaift; a.

partments, said upper compartment having a. discharge opening; a diaphragm formii'ig the bottom of the lower compartment; means for vibrating the diaphragm; alongitudinal shaft in the upper compartment; .a curved blade in the shaft; 1a screwzconveyer on the shaft at the discharge end of the upper compartment; a regulating :box iconnected to the loWercompa-rtment; and means for feeding material into the upper 00111- partment.

JOSEPH WHITE. 

